Depends on what you're looking for. If it's increased hp/performance, might want to re-direct your money to something proven to increase hp. If it's sound, go for what you like. If you're considering a catback, might want to consider just replacing the muffler as that will give you pretty much all the gains you'll get from a catback. A catback by itself might get you 2-3hp at the high end of the rpm range. Kind of a big $$$ outlay for that kind of increase.

I have a 2011 Tacoma Double cab and I am looking for a good exhaust as well. I really like the Flowmaster kit with the dual tips. Has anyone installed this system?

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I have an 08 trd sport 4x4 double cab with flowmaster 40 series dual exhaust and a AFE cold air intake. It sounds good but when you are driving down the road and hit about 3-4 rpm it intimidates other trucks, it sounds awesome.